Carbureter.



E. A. RIOTTE.

GARBURETER:

APPLICATION FILED um. 16. 1912.

I Patented Sept. 30, 1913. I 2 SHEETS-BEBE? l.

y N 20 I Z 1 U u A l 4 I I WW avwento'o B. A. RIOTTE.

OARBURETER.

APPLICATION TILED JAN.16. 191Z.

Patented Sept. 30, 1913.

2 SHEETS-SHEET 2.

5] vwe nto'c E111? forni- UNITED STATES PATENT OFFICE.

EUGENE A. RIOTTE, F BRONXVILLE, NEW YORK,-ASSIGNOR TO STANDARD MOTOR CONSTRUCTION COMPANY, OF JERSEY new JERSEY.

'CITY,1\TEW JERSEY, A CORPORATION OF I CARBURETER.

Specification of Letters Patent.

"Patented Sept. 30, 1913.

Application filed January 16, 1912. Serial No. 671,466.

To all whom, it may concern: Be it known that I, EUGENE A. Itrorm, a citizen of the United States, residing at ,Bronxville, Westchester county, State of New York, have invented certain .new. and. useful Improvements in Carburetors, of; which the followingisa full, clear, and ex- Y act description.

My invention relates to improvements in.'

Vaporizers forinternal combustion engines.

. and consists in an improved embodiment of. that type of vaporizer set forth and claimed use on relatively small engines of .the inter nal'combustion variety.

Inthe' drawings, Figure 1 is a vertical sectional view illustrating the. several parts inoperative-position. Fig. 2 is :a horizontal sectional view on the plane of the line mw,

Fig. 1. Fig. 3 is a development view of the sleeve with the sprayer tips shown in dotted lines. 1 represents the casing of a reservoir arranged to hold liquid fuel which is admitted through a pipe 2.

3 is a .valve ordinarily controlled by a fioatet which valve controls the fuel admission duct to maintain said fuel at a proper level within the casing 1.

55 represent a plurality of open ended sprayer tips at the upper ends of pipes.

WlllGhzlEfld down into the fuel casing 1 so that their'lower ends will be immersed in the liquid fuel therein.-

6 represents a mixing tube connected to the upper part of the casing 1, preferably in the manner hereinafter: described, which tube 6 also constitutes the feedpipe leading to the motor, -7 represents a manually controllable throttle or damper therein. The pipe 6 at its lower end is preferably pro vided with foot or flanged portionv 8 which overst-ands the reservoir 1,. said reservoir, of course, being closed at the top, against the escape of fuel. This flange 8 is spaced apart from the top of the reservoir somewhat so as to provide an annular air admis- :voir casing by legs 99\-prov',ided in any suitable number.--. .Asshowmthe .open ended.

tips or fuelsupplyznozzles 55 project into said. passage so that as the draft of. air rushesthrough theadmission passage and over the. aforesaid'tips, fuel will be drawn up to mix-with the entering air to form the mixture in the carbureting chamber.

1.0 -is a tubular sleeve by which the area of. the. inlet passage may be manually regulated. This regulating, sleeve may be mounted in the foot piece of the pipe 6 and may be adjustable up and down by any suitableemeansyfor example, thetubular portion of said foot -piece.may have anoblique slot 11 cut-therein... 12 is a screw. WlllCh .passesthrough saidslot and screws-into the sleeve 10;. .By. loosening the screw, it: may be. used as ahandle to. partially :turn the sleeve 11 so: that, as the sleeve isturned, the

;screw:.will:moveup or down the inclined slot. 11,-.and :willthereby raise or lower the .regula,ting sleeve to vary the area of-the inlet passage to the desired extent, thereby making iteasy to. adjust the vaporizer to different motors. When the desired adjustment of the :regulating sleeve 10 has been effected, the. screw 12 maybe tightened up to hold it fixedly in saidregulated-position.

:The means for: automatically controlling the volume of mixture, and for-preserving the proper proportion of fuelrelatively to air, comprises an automatically operable sleeve l i-which; slides up. and down in a guide tube at the center of thesreservoir 1. This sleeve l4-is clcsedat its lower end by a partition 15 so .that it may act as a piston. The lower end of the-tube in' which the sleeve 14 moves is also closed as at-16 excepting for a small external duct or bleed passage 17 to forma dash .pot. The bleed .passage 17 vents the dash pot and permits said piston-like sleeve 14 to ascend and descend with not undue speed." If desired a controlling valve 18 may be employed to control the size of the bleed passage 17.

The-sleeve 14 extends above the air admission passage at the foot of tube 6 so that, were it not for openings in the sides of the sleeve, said passage would be closed. Tprovide, however,-suitable openings in the side walls of said sleeve, so designed that, when the sleeve is fully downor in its lowermost position, it nearly cuts off said passage. As soon as a vacuum in the carbureting chamher is created, this vacuum lifts the piston sleevel, at.whichtime the admission pas- 14 are best seen in the development view,

7 of air and gas will be provided.

Fig. 4, in which A-B-O represent said openings, all of which are narrowest at the top and widen toward the bottom, one edge of each opening being preferably substantially vertical, the other edge being inclined.

The sprayer tips 55 are so arranged around the air admission passage that as the piston sleeve 14 ascends, the said tips will be progressively uncovered to the current or draft of inrushing air. form shown, there are nine tips provided and the-relative position of said tips is indicated conventionally in the development view, Fig. 4. In the form shown in that view, one of the openings A has a slight upward extension A which, even though the piston sleeve 14 stands in its lowermost position, will afford a slight opening at least for the admission of air adjacent to one of the tips 5 whereby, the moment the engine is started and the vacuum created, a mixture 19 is a weight which may be detachably secured to the piston sleeve 14, which weight may be varied to adjust the iston for proper action with different engines.

Obviously, when the carburetor is de signed'for any particular engine, the piston sleeve 14 may be made of the proper weight at the outset, but inasmuch as said carbureters may be applied to different engines, it is desirable to provide means for easily modifyin the weight of said piston.

From t e foregoing it will be seen that it is the force of gravity that is relied upon to mov'e the piston sleeve 14 downwardly, the upward movement thereof being secured by a partial vacuum in the carbureting tube or chamber.

To guard against admission of dust or dirt, a screen 20 may be provided around the legs 99. While the construction of the vaporizer itself is such that the admission of dust will not impair its action, it is exceedingly undesirable to permit dust or dirt to enter the engine cylinders or pass the valves thereof.

It will be observed that in operation the automatic throttle is in effect in free suspension, it being upheld by the tension of air in the carbureting chamber which remains substantially constant. Of course, as a greater volume of mixture is demanded and the throttle is opened to provide such increased volume, there will be a momentary tendency to increase the tension or vacuum w h1ch will lift .the automatic throttle .at a highei level; but inasmuch as the raising of the throttle admits an increased volume of air the said increased volume will be found to be In such proportion as to supply a sutfi- In the particularcient quantity of 'air to the carbureting chamber to preserve the initial air tension or vacuum, which, as above suggested, remains substantially constant irrespective of the volume of mixture being formed and transferred through the feed pipe. I

Since the preferable construction contemplates the utilizing of the weight of the automatic throttle to counteract the lifting tendency of the vacuum, and since a weight is a constant, it follows that there will be the greatest accuracy in the operation of the instrument.

While the piston or dash pot efiect above referred to prevents abnormally quick movement of the throttle when the apparatus is subjected to quickly varying loads, it also is of decided advantage when the apparatus is used on automobiles traveling over rough roads where said apparatus will be subjected to heavy vibration, for in suchcase, it will be found that such vibration will have no perceptible influence on the throttle by reason of the checking action of said piston or dash pot. One simple means for guiding the automatic throttle sleeve may comprise a fixed guide-pin standing in a vertical slot22 in said sleeve.

What I claim is:

1. In a carbureter, a carbureting chamber, an air admission passage at the base of the same and extending around the same, means for manually varying the area of said passage, a plurality of open-ended fuel supply nozzles arranged around said carbureting chamber and adjacent to said air admission passage, an automatically controllable throttle comprising a piston sleeve, the walls of said sleeve having vertical openings therein which are narrow at the top and widen downwardly, said sleeve overstanding said air admission passage, a'piston at the lower end of said throttle, a dashpot at the lower end of said piston having a relatively small external vent to permit said portion to slowly ascend and descend and to thereby permit said throttle to slowly ascend and descend to vary the eflective slze of the air entrance passage and to progressively expose said nozzles to the draft of air through said passage as said throttle ascends and to progressively out out of the line of draft said uel supply nozzles as said throttle descends. 2. In a carbureter, a tubular carbureting chamber having an annular air admission passage at its lower end, a plurality of openended fuel supply nozzles arranged around said 0 eningand in front of the same, a sleeveike throttle arranged to move up and down in said tubular carbureting chamber, and a tubular guide for said throttle be-' closed at'its lower end, the sides of sai sleeve being slot-ted, said slots being narrow at the upper part and increasing in width downwardly whereby a vacuum in said mixing chamber will ralse said sleeve and open said air passage more and more as said sleeve ascends and simultaneously and progressively expose said nozzles progressively to the influence of the draft of entering air, said piston descending by gravity as said vacuum decreases, correspondingly reducing the eifective area of the air admission passage and correspondingly cut out of the line of draft progressively the said fuel supply nozzles.

3. In a carbureter, an annular liquid fuel reservoir, a tubular carbureting chamber mounted concentrically thereabove and spaced apart therefrom forming an air admission passage direct to the atmosphere on all sides, a concentric guide tube within the reservoir, means for manually varying the area of said passage; a plurality of open ended supply nozzles arranged around said carbureting chamber and entering said air passage, an automatically controlled throttle comprising a piston sleeve sliding in L. S. JAMES, E. E'. MoRsE; 

